Bicycle



FIG. 1 is a right side view of a bicycle showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is front view thereof;

FIG. 6 is a back view thereof. 

The ornamental design for a bicycle, as shown and described. 